Manufacturing process for halogen-free low-smoke anti-flaming B-type irradiation crosslinking polyolefin insulated wires

Abstract

The invention provides a manufacturing process for halogen-free low-smoke anti-flaming B-type irradiation crosslinking polyolefin insulated wires. The manufacturing method includes that S1, copper wires enter a wire stretcher for stretching; S2, copper cores after being stretched by the wire stretcher are annealed and heated through three metal guide wheels connected with a heating power supply; S3, the wires after being annealed and heated are extruded by a screw of a plastic extruding machine, and plastic is extruded on the copper cores; S4, irradiation crosslinking is performed by an electron accelerator. Wires processed by the manufacturing process have good plasticization of insulating materials, small screw load and better insulating surfaces. Through reasonable mould matching, temperature at each section of the plastic extruding machine is strictly controlled, decomposition of low molecular materials in insulating materials caused by overheat is avoided to prevent the insulating materials from having air holes or unsmooth surfaces. Segmentation cooling is adopted after insulating extrusion (after mould stripping), and generation of insulating internal stress is avoided, so that excellent performance of products is guaranteed.

Description

technical field [0001] The invention relates to a wire processing technology, in particular to a halogen-free, low-smoke, flame-retardant Class B irradiation cross-linked polyolefin insulated wire manufacturing technology. Background technique [0002] The phenomenon that the mechanical properties (tensile strength, elongation, etc.) and physical and chemical properties (resistivity, thermal conductivity, etc.) of metals change during the plastic deformation process is called work hardening; Changes in the wire will cause it to harden, become brittle, and increase the resistivity. In order to restore the plasticity of the monofilament and maintain the good electrical properties of the material, it is necessary to heat-treat the wire at a certain temperature (annealing). However, in the existing processing process, the metal wire in the wire drawing process is annealed. Generally, an annealing device is specially provided. Wrapped into a roll. In this way, two processes of ...

AI Technical Summary

Problems solved by technology

However, in the existing heating process, the low-molecular substances in the insulating material are easy to decompose, resulting in pores or rough surfaces in the insulation; internal stress in the insulation will be generated during cooling, and the performance of the product cannot be guaranteed.